Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04c5acbccc10899…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 01:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 666c6a99805870ff5b6e860679f04823 SHA-1: 0ccf97c8ca836f07e3e8916b96de857fbae3b149 SHA-256: a04c5acbccc1089919848ea4abc3c18fd7baaf1c36b0908addf04f6bcc067724
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the primary purpose is to redirect users, potentially to malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://akademia-jedenastka.pl/zdjecia/fck/file/dikop.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609f65fc12bac---lubosomigigitibetupo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/02738ca404ce267ee5232bcbf6fe4454/58600874865.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607998709f671---xosiwiximexemelosi.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/52195931177.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16207398773301.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd87d0524---91488522062.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/073d6b1319da35060f08e70ef7edde41/gorugufujavagujajo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608148a721552---godotusiwozu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501005659300523250.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/90295070732.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/14207705466.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077538f30a32---wakoxolebiduzorudexuwan.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/waligekufikiz.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/pibopisetoviripedanulit.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210614_74EF82969DDE1172.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfc7744b7---gunufax.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kasizovuwivejulutukemi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a030900719a---sogafek.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606faddd93219---juzodojesajudawinekuro.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056d6aed77---jorekanilojatasapatewite.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501054245.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e035vo9v85a8k6t3aefanj03to/45417450179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=games+strategies+and+decision+making+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 11180 bytes
SHA-256: f4bb24ce819ac3cb83f6588c1cb4df83f62f9d2cff02069be743eeacf541cefd
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 16888 bytes
SHA-256: db74e7bc47e073c8af3099918984c81a08dc8c9f014473628f6f0c362d1a77df

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